[Webkit-unassigned] [Bug 77272] New: FileReader read speed is being throttled?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77272

           Summary: FileReader read speed is being throttled?
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: craigyk at me.com


I've found that the read speed using FileReader seems to be artifically throttled to ~8MB/sec.   The same code in Chrome gets much faster speeds (reading from an SSD, 100MB/sec+).  I know the FileReader isn't complete yet, but I thought the heads up might be nice... this speed limitation is currently the bottleneck in the resumable uploader I'm building... I've gotten the MD5 hashing speed up to 20MB/sec/thread in JS.

I'm hoping for confirmation that my interpretation is correct (that it's throttled), and to give a heads up on this performance limitation.  I recognize that FileReader in the nightly isn't production-ready yet.

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